/*
*********************************************************************************************************
*                                             uC/GUI V3.98
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              �C/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : WM_SetFocusOnNextChild.c
Purpose     : Implementation of WM_SetFocusOnNextChild
----------------------------------------------------------------------
*/

#include "WM_Intern.h"

#if GUI_WINSUPPORT    /* If 0, WM will not generate any code */

/*********************************************************************
*
*       static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _GetNextChild
*
* Purpose:
*   Returns a handle to the next child of a window.
*
* Parameters:
*   hParent:  handle of parent window.
*   hChild:   handle of child to begin our search to its next sibling.
*
* Return value:
*   Handle to next child if we found one.
*   0 if window has no other children.
*/
static WM_HWIN _GetNextChild(WM_HWIN hParent, WM_HWIN hChild)
{
	WM_HWIN hObj = 0;
	WM_Obj* pObj;
	if (hChild) {
		pObj = WM_HANDLE2PTR(hChild);
		hObj = pObj->hNext;
	}
	if (!hObj) {
		pObj = WM_HANDLE2PTR(hParent);
		hObj = pObj->hFirstChild;
	}
	if (hObj != hChild) {
		return hObj;
	}
	return 0;
}

/*********************************************************************
*
*       _SetFocusOnNextChild
*
* Purpose:
*   Sets the focus on next focussable child of a window.
*
* Return value:
*   Handle of focussed child, if we found an other focussable child
*   as the current. Otherwise the return value is zero.
*/
static WM_HWIN _SetFocusOnNextChild(WM_HWIN hParent)
{
	WM_HWIN hChild, hWin;
	hChild = WM__GetFocussedChild(hParent);
	hChild = _GetNextChild(hParent, hChild);
	hWin   = hChild;
	while ((WM_IsFocussable(hWin) == 0) && hWin) {
		hWin = _GetNextChild(hParent, hWin);
		if (hWin == hChild) {
			break;
		}
	}
	if (hWin) {
		if (WM_SetFocus(hWin) == 0) {
			return hWin;
		}
	}
	return 0;
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       WM_SetFocusOnNextChild
*/
WM_HWIN WM_SetFocusOnNextChild(WM_HWIN hParent)
{
	WM_HWIN r = 0;
	if (hParent) {
		r = _SetFocusOnNextChild(hParent);
	}
	return r;
}

#else
  void WM_SetFocusOnNextChild_C(void) {} /* avoid empty object files */
#endif

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